Locking mechanism for dump-wagons.



H. D. JOHNSON. JR. LOOKING MECHANISM FOR DUMP WAGONS.

' APPLICATION FILED DEG.18,1913.

Patented Feb. 9, 1915.

D sTATEerA v HARRY D. Jormsonan or' sourH mini), INDIANA.

To all whom'vlt may concern Be it known that I, HARRY D. J orrnson, J r., citizen of the United States, residing at South Bend, in the county of St. Joseph and State of Indiana, have invented certain new and useful Improvements in Looking Mechanism for Dump-Wagons, of which the following is a specification.

This invention relates to improvements in locking mechanism for dump-wagon WlIldlasses, and has for its particular object, to'

provide a lock for the Windlass wherein the strain imposed upon the locking-pawl by the tendency of the Windlass to unwind, caused by the weight of the load, is exerted upon a solid support and not upon the pivots of the These and other objects hereinafter set forth, are attained by the means illustrated in the accompanying drawing, in which Figure 1, is a side elevation of the inn-1 proved locking mechanism showing the Windlass in cross-section. Fig. 2, is a central vertical longitudinal section through the locking pawl the same being shown on its support. Fig. 3, is an end. view of the locking-pawl showing its support in section, and Fig. 4, is adetail perspective view of the locking-lever. I i

Similar reference numerals in all of the figures of the drawing designate like parts.

This device is adapted to be located in the foot-pit of dump-wagons, and comprises a supporting plate 5, a locking-pawl 6, a pawllever 7, and alock 8, so positioned to the usual chain Windlass, that the locking-pawl canbe thrown into engagement with the ratchet 9, to prevent its reverse rotation.

The windlass 10 extends from side to side of the wagon-body, and is supported in any well known manner to rotate and wind the usual chains which close the dumping doors of the wagon, and said Windlass is operate in the winding direction by the usual handlever 11, which is provided with the well known hand operated pawl 12.

Supporting late 5 is secured to one side of the wagonody and to the bottom, by the bolts 13, and is formed with a vertical I Specification of Letters Patent.

with a vertical arm 19 and a operator LOCKING MECHANISM non numr-waeons.

extension 14: having a curved upper surface 15,,upon which is formed a rib 16, that is curved correspondingly to the surface 15.

Locking-pawl 6 is formed with an under curved surface 17 and provided with a curved longitudinal groove 18, said groove and under surface being curvedto conform tothe surface 15 and rib 16 of the extension 14. Said, pawl 6 is adapted to slide back and forth on top of the extension into and out of'engagement with the ratchet 9, which is in alinement therewith, and it is operated Patented Feb. 9,1915. Application filed December is, 1913. Serial No. 807,418.

by the pawl-lever 7, which is pivoted at 18 to the supporting platet, and is provided horizontal arm 20. The curved surfaces 15,

.17, the rib 16 and the groove 18 of the plate 5 and pawl 6, are-curved on a radius from the pivot 18 of the pawl-lever. Thus as the lever is rotated on its pivot, the upper end of the arm 19 moves back and forthcarrying the pawlo therewith, the same being pivotally secured thereto by the pin 21.

The groove 18 in the pawl 6, inclines up- .wardly and forwardly at the front end thereof as indicated at 22, so that it can tilt on its pivot to ride overthe teeth of the ratchet 9, and is'also provided with extensions 23 which are adapted to engage the substantially surfaces 15 to prevent the overturning of the pawl. Arm 20 of the locking-lever is somewhat longer than the arm .19 and extends toward the front end of thewagon- Itis provided with a fiat portion. 2,-J;Which is adapted to be engaged by the. foot of the to initially release the pawl from the ratchet, and when released, the weight of the arm 20 will carry the pawl farther in the releasing direction.

To look the pawl 6 in an operative position the lock 8 is provided, the same being pivoted at 25 to the supporting plate 5, and comprises a locking lug'26 which is adapted to engage the under-side of the arm 20, a forwardly extending arm 27 having a projection 28, and a top-lug 29. which is adapted to engage a stop 30, preferably formed on the -supporting plate 5. The lug 26 lies in alinement with the arm 20, and the arm 27 is ofiset therefrom, as clearly shown in Fig. .4, so as not to engage the arm 20 when the lug 26. 's thrown to an unlocked rom the pivotcenter 25, to form a good bearing surface between the 'coijperating parts. i K In operation, assuming that theparts are relatively positioned as'shown in thedrawing. with the door chains, not shown, 1111- wound, a movement of. thewindlass clockwise ,will wind the chain, and the. pawl 6 willtilt on its pivot and snap over theteeth of the ratchet until the chain cannot be wound ti hter, The pawl quickly assumes its norma position when lifted bythe teeth of the ratchet,owing'to its greater weight bein on the ratchet-wheel side, and it will 7 be p ainly seen, that the'strain of the return so that the loadwill verse movement of the Windlass, is resisted directly through the body of the pawl and uponthe supporting plate, The pivots ofthe pawl and its operating-arm will not; be

afi'ected, 'To release the pawl 6 from the ratchet, the lock 8 is first operated clockwise, which releases the arm 20, then a slight pressure on the end of said arm will withdraw the pawl 6 from engagement with the ratchet and the Windlass is then free to be dumped, It is obvious, that when the'windlass is to be re:

wound,'the lock ,8 is operated anti-clockwise lifting' .thearm 20 and sliding the pawl once more in position for engagement with the. ratchet, and itcannot be moved from this engaging position until {the lock.

8 is first operated, therefore, any accidental .displacement, through vibration or otherwise, is avoided.

Having thus fully described theinvention, what is claimed isz-e- 1."In a device of the character described,

a ratchet, a1 stationary support, a pawl "mounted for edge toedge slidable engagement with said support, and means for bodily shifting said pawl back and. forth "on said edge, said pawl being mounted in a manner relatively to said support as to cause the load imposed thereon to be carried directly by the support.

2. Ina device of the character described,

a ratchet, a' stationarysupport, a pawl mounted for edge to edge slidable engagement with said support, cotiperating means on said pawl and support for guiding said pawl .in its sliding for bodil port, sai pawl being mounted in a manner relatively to said support as to cause the ortion of its length, is curved from a radius movements, and means shlftmg said pawl on said supload imposed thereon to be carrieddirectly by the support,

3.- In a device of the character described, a ratchet, a stationar support, a pawlmounted for edge to e ge slidable engagement with said support, and meanspivoted .to said support for shiftingsaid pawl thereon, said pawl being pivoted to said shifting means and mounted in a manner relative to said support asto cause the load 65.

imposed on saidpawl to be carried directly by the support. a

' In a device of the character described,-

a ratchet, a stationary support, a pawl mounted for edge to edge slidable engage- 7o ment with said support, means pivoted to said support for shifting said pawl there- 9 on, said pawl being pivoted to. said shifting means. and. mounted 111 a manner relative to said support as "to cause the load imposed on said pawl to be carrieddirectly by the support, and a locking means for engaging said shifting means to retain said pawl in an operative position.

5. Ina device of the character described, so

a ratchet, a stationary support, a pawl mounted for edge to edge slidable engagement with said support, means pivoted to said support for shifting said pawl thereon,

said pawl being pivoted to said shifting means and mounted in a manner relative to said support as to cause the load imposed on said pawl to be carried directlvby said support, a locking means for engaglngsaid pawl m an shifting means to retain said operative position, and codperating means on said locking means and the support for limiting the throw of said locking means in one direction. a

' 6. In.a device of the characterdescribed,

a ratchet, a stationary support, a pawl mounted for edge to edge slidable engagement with said support, and means for shifting said pawl on said support, said pawl being mounted in a manner'relati-ve to said support as to cause the load imposed on said pawl to be carried directlyby said support and also being provided with a cut- 7 away front portion whereby it can tilt in one direction to ride over the ratchet teeth.

In testimony whereof I aflix my signature. in presence of two witnesses.

' HARRY D. JOHNSON, JR. Witnesses: .1 v

Jam: F. Coma, A Romin'r C. Poem. 

